#include <bits/stdc++.h>

#define in read()
#define fi first
#define se second
#define pb push_back

using namespace std;

using pii = pair < int , int >;
using vec = vector < int >;
using veg = vector < pii >;
using ll = long long;
using db = double;

int read() {
    int x = 0; bool f = 0; char ch = getchar(); while(!isdigit(ch)) f |= ch == '-',ch = getchar();
    while(isdigit(ch)) x = x * 10 + (ch ^ 48),ch = getchar(); return f ? -x : x;
}

int main() {
#ifndef ONLINE_JUDGE
    freopen("1.in","r",stdin);
#endif
    int x = in;
	if(x < 40) cout << 40 - x<<endl;
	else if(x < 70) cout << 70 - x << endl;
	else if(x < 90) cout << 90 - x  << endl;
	else cout << "expert" << endl;
	
}
